JPH0414363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to electrically controlled pressure reducing valves.

[Prior art]

This type of pressure reducing valve controls the output pressure to remain constant regardless of the input pressure, even if the input pressure exceeds the limits of the pressure valve controlled by the proportional magnet.

The valve housing has a hole open to the proportional magnet. This hole accommodates a valve sleeve containing a piston. The valve housing, including the valve sleeve, is connected to the magnet housing by a plurality of screws. These screws extend through axial holes in the proportional magnet housing and are screwed into threaded holes in the valve housing. If there is a dimensional tolerance for angular alignment between the hole in the valve housing and the magnet mounting surface of the valve housing, as well as between the valve sleeve and the mounting surface of the proportional magnet, tighten the screw to attach the proportional magnet to the valve housing. If the piston is pressed too hard, the piston will become stuck inside the valve sleeve.

[Summary of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pressure reducing valve which eliminates these problems associated with valves of this type. That is, the present invention provides a pressure reducing valve that operates more reliably.

In the present invention, the valve sleeve and piston of the pressure reducing valve are assembled such that after the magnetic housing and the valve housing are assembled together and tightened with the coupling screw, the valve sleeve containing the piston is aligned with respect to the magnetic housing by the overhang. Connected to the magnetic housing. In other words, like the valve sleeve and the valve mounting surface, the above-mentioned overhanging portion will cause damage if the valve hole and the magnet mounting surface are not even slightly aligned angularly.
distortion, which can reliably prevent the valve sleeve from deforming if both housings are pressed together.

The outer periphery of the valve piston is provided with an annular groove forming a control edge for the passage of fluid at the port connected to the input pressure source; however, in other embodiments of the invention, the control edge is provided on the valve piston. It is formed by a recess in the sleeve. Therefore, the cross section between the inner bore and the outer diameter of the valve piston is not weakened, which is particularly advantageous for pistons with small diameters and increases the reliability of operation and shortens the service life. Extends.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

The pressure reducing valve 10 consists of a valve housing 11 containing a bore 12 in which a valve sleeve 14 is located. This valve sleeve 14 includes a bore 15 in which a piston 16 is located. In Figure 1,
The piston 16 has an annular groove 17 communicating with an axial central bore 19 via a plurality of radial bores 18 .

A spring 20, which is provided between the shoulder 21 of the valve sleeve 14 and the end of the piston 16, forming a spring retainer, presses the piston 16 against the armature pin 24 of the proportional magnet. Incidentally, FIG. 1 shows the housing 25 of this proportional magnet.

The target output pressure of the valve is controlled by a proportional magnet. The armature pin 24 of this proportional magnet moves the piston 16 against the force of the spring 20 to the position where the valve is open so that pressurized fluid from a passageway 26 connected to an input pressure source flows through the annular groove 17 and the bore. 18, 19, and is sent to a passage 27 where output pressure is obtained. When the output pressure acting on piston 16 reaches a target value, piston 16 moves and restricts the flow of fluid from passage 26 to passage 27. When the output pressure in the passage 27 increases to a value higher than the pressure determined by the proportional magnet, the piston moves until the annular groove 17 closes the passage 26 and connects the passage 27 to the passage 28, releasing the pressure to the reservoir. 16 moves further.

Valve housing 11 and magnet housing 25 are connected to each other by screws 35 that extend through an axial bore in magnet housing 25 and engage threaded bores 30 in housing 11. In addition, in FIG. 1, the screw 35 is 1
Only one is shown.

On the front of the proportional magnet housing 25,
A circular recess 31 is provided. At its largest diameter, the flange 32 has a radial play relative to the recess 31. Similarly, the recess 31 is
It is deeper than the thickness of the flange 32, so the flange 32 also has play in the axial direction in the recess. An annular groove 33 accommodating the sealing ring is formed in the recess 3
It is provided on the radially outer side of 1. Annular groove 33
A claw-shaped projecting portion 34 extending from the front of the housing 25 between the flange 3 and the recess 31
2 is deformed or bent onto the flange 32 so as to snap the flange 32 at several locations along its outer circumference. Thereby, the valve sleeve assembly including the valve sleeve 14, piston 16, and spring 20 is assembled to the magnet housing 25.

When the device consisting of the valve sleeve 14, piston 16, spring 20 and proportional magnet is connected to the valve housing 11 by means of the screw 35, the position of the valve sleeve 14 with respect to the magnet housing is adjusted and the valve sleeve 14 and Similarly, between the magnet housing 25, the valve hole 1
The overhang 34 is deflected to compensate for the angular misalignment of the valve housing 11 between the magnet mounting surface 36 and the magnet mounting surface 36. The number of pawl-like extensions 34 and thus the stability of the connection are selected such that the extensions 34 are distorted before the valve sleeve 14 is displaced or deformed. Therefore, jamming of the piston within the valve sleeve is safely avoided and the valve sleeve can be aligned in any position.

In another embodiment shown in FIG. 2, the piston 116 does not have an annular groove, but the valve sleeve 114 has a recess 115. This recess 115 has a rectangular cross section, and the size of the recess 115 in the direction perpendicular to the piston axis is larger than the diameter of the piston. This corresponds to the radial bore 11 of the piston.
8 together form a control edge 117. These holes 118 open into axial holes 119 . The bore 119 communicates via a radial bore 140 with the passageway 28 which communicates with the reservoir. Other components are similar in structure to those shown in FIG. 1 and have the same reference numbers.

The embodiment of FIG. 2 is similar to the piston 1 in FIG.
The annular groove 17 of No. 6 prevents the cross section of the piston from becoming weak. This is particularly effective when the piston diameter is relatively small. The diameter of the piston is determined by the value of the output pressure. Therefore,
The pressure reducing valve shown in FIG. 2 is suitable for high output pressures.

The rectangular shape of the recess 115 results in a straight control edge 117 orthogonal to the piston axis. Therefore, even when the piston rotates, the control edge 117
The overlap between and the radial hole 18 remains unchanged.

[Brief explanation of drawings]

FIG. 1 is an axial sectional view of a first embodiment of the pressure reducing valve of the present invention, and FIG. 2 is an axial sectional view of the second embodiment of the pressure reducing valve of the present invention. 10... Pressure reducing valve, 11... Valve housing, 12, 15, 18, 19, 30... Hole, 14
...Valve sleeve, 16...Piston, 17...
...Annular groove, 20...Spring, 21...Shoulder, 2
2... Spring holding member, 24... Armature pin, 25... Housing, 26, 27, 28...
Passage, 31...Circular recess, 32...Flange, 3
5...Screw, 36...Magnet mounting surface, 114
... Valve sleeve, 115 ... Recess, 117 ...
...control edge, 119...axial hole.

Claims (1)

[Scope of Claims] 1. A valve housing having a valve hole provided therein; A sleeve assembly, comprising: a valve sleeve;
a valve sleeve assembly to be received in the valve bore, the valve sleeve assembly including a piston slidably disposed in the bore of the valve sleeve and a spring disposed between the piston and the valve sleeve; a proportional valve to be secured to the valve housing; a proportional magnet having an armature pin in contact with the piston, thereby controlling a predetermined output pressure; for assembling the valve sleeve assembly to the housing of the proportional magnet, the valve sleeve 14; 114 is provided with an annular flange 32; a circular recess 31 for accommodating the annular flange 32 with play is provided on the front surface of the housing of the proportional magnet; An electrically controlled pressure reducing valve characterized in that the annular flange 32 is fixed by being deformed upward. 2. In the pressure reducing valve according to claim 1, the annular flange is fixed at a plurality of locations by deforming a portion of the peripheral edge of the circular recess 31 onto the annular flange. A pressure reducing valve characterized by: 3. In the pressure reducing valve according to claim 1, the end portion 22 of the piston that is flush with the front surface of the valve sleeve 14, 114 and the shoulder 21 of the hole of the valve sleeve 14, 114 are spring holding means. A pressure reducing valve characterized by forming a part. 4. The pressure reducing valve according to claim 1, wherein the piston has an axial central hole and at least one radial hole, the central hole communicating with the output pressure passage and the radial the directional hole selectively communicates with an input pressure source or reservoir, and
A control edge 117 communicating between the input pressure passage 26 and the radial bore 118 is connected to the valve sleeve 11 .
A pressure reducing valve characterized in that it is provided with a second radial hole 140 which is formed by four rectangular recesses 115 and which communicates the axial hole 119 with the reservoir 28. 5. The pressure reducing valve according to claim 4, characterized in that the control edge 117 of the rectangular recess 115 is wider than the diameter of the piston 116.